chris tin campbell. her mom said she had a heart of gold. investigators are turning to the public for any information about monday's attack. >> we're asking anyone who may have heard someone speak about the marathon or the date of april 15th that indicated that there was a target to call us. someone knows who did this. they say they'll try to reconstruct the bombs which were apparently made in pressure cookers hidden in backpacks. >> we are moving the evidence to a lab in virginia for a complete analysis. >> reporter: president obama will travel to boston thursday for a service dedicated to the victims. >>> this was a heinous encoredly act. and given what we now now about what now took place, the fbi is investigating it as a about of terrorism. >>> we're learning more about the unity and the solidarity of the people of boston. people coming together to donate blood and money to the families of those who perished here. reporting from boston. back to you. >>> more details now about the explosive devices, a fox tv station from atlanta obtained